That offer is available to users that have never had Premium on their account before (via a subscription or a trial).
Also, It's not possible to get one of the offers with a payment method that's already been used to purchase a subscription or another offer before.
If that doesn't apply to you, fill out the contact form, and someone from Spotify will be happy to help you within 24 hrs. Don't forget to check your spam folder for responses as they may end up there.
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